/Engine/Source/Editor/SkeletalMeshEditor/Public/SkeletalMeshEditorSubsystem.h
Get number of mesh vertices for an LOD of a Skeletal Mesh
Number of vertices. Returns 0 if invalid mesh or LOD index.
int32 GetNumVerts ( [USkeletalMesh](API\Runtime\Engine\Engine\USkeletalMesh) * SkeletalMesh, int32 LODIndex )